Nalyna had us due to interchanging water pressure. It would be fine one day and low another day. Upon inspection we found that the thermal expansion tank had burst. This is usually a sign of spikes of high water pressure. They had a PRV that had broken. When I tested pressure I got a reading of 82-90 PSI. The PRV most likely broke first which caused fluctuation in water pressure along with popping the bladder of the expansion tank which also caused pressure issues. We installed a new PRV with a built in gauge along with a new expansion tank.